Walking stick



FIG. 1 is an environmental side elevational view in reduced scale of a walking stick showing my new design, the portion of the figure shown in broken lines representing a user of the design and forming no part of the claimed design;

FIG. 2 is a side elevational view thereof, the remaining side, front and rear elevational views being identical due to the radial symmetry of the design;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a walking stick, as shown and described. 